Paper container and method of producing same



Qct. 6, 1936. w, E AMBERG- 2,056,893

PAPER CONTAINER AND METHOD OF PRODUCING SAME Filed J 1y 1, 19:56

mvmbm Patented Oct. 6, 1936 UNITED STATES PAPER CONTAINER AND METHOD OFPRODUCING SAME Walter E. Amberg, Chicago, 111.,

versal Paper Products Company,

assignor to Uni- Chica 111-. v

a corporation of Illinois Application July 1, 1936, Serial No. 88,451

, 9 Claims. This invention relates to paper containers, and

has for an important object thereof the provision of an improved type ofcone-shaped paper cup for use in dispensing water, soda and otherliquids.

A cup of a type commonly used today is disclosed in Reissue Patent No.15,381, granted June 13, 1922, upon application of one Di F. Curtin. Astherein'sh'own, the blank from which the cup is formed is ofapproximately triangular form, having an extension located at thejunction of two converging edges. In the manufacture of cupsfrom blanksof this type and in the manufacture of paper cups generally today it iscustomary to sheet of suitable paper. In so doing the paper is stretchedacross a flat surface and the dies, which are arranged to cut. themaximum number of blanks from the paper, descend and perform the cuttingoperation. Thereafter the blanks are stacked, magazined' andsubsequently are fed singly to a cup-folding mechanism. In formingblanks of such configuration a great deal of paper is wasted despite thecare which may be exercised in arranging the dies.

It has also been heretofore proposed to form cup blanks from a roll ofpaper by stamping them or cutting them from the roll, one by one, as thepaper is unwound. Here again, however, owing to the shape orconfiguration of the blank, 9. considerable amount of the paper in theroll is wasted. Such paper is scrapped and forms no part of the finishedcup.

With the foregoing desideratum in view, an important feature of thepresent invention resides in the provision of a cup blank and animproved cup formed therefrom which may be made from a roll of paperwithout any appreciable loss or waste thereof.

In accordance with the practice of the present invention, a roll ofpaper, the width of which corresponds to the width of the cup blank, iscut transversally in a manner scribed to form a series of blanks withoutwaste.

Another important feature of the invention resides in the provision ofan improved cup formed from blanks of the character herein described.This cup is distinguished by the fact that it has a double thickness atits top portion where strength is desired, and a single thickness at itsbottom or apex portion where strength is not essential. The provision ofa cup of this type permits. the use or? lighter stock and inasmuch asthere is no waste resulting, a stronger cup is obtain-ed. in otherwords, although the paper stock may be lighter, the entire stock goesinto the cup, none of it being scrapped, with the recult that astronger, more rigid container is obtained.

@ther objects and ieatures of the invention will die stamp the blanksfrom a large hereinafter to be debecome apparent from a reading of thefollowing side elevational view in perspective of the cup shown inFigure 2; and Figure 4 shows a cup in the process of being formed fromblanks of the type indicated in Figure 1.

Asillustrated, a strip of paper II), the width of which corresponds tothe width of the cup blank to be formed therefrom, is fed from a roll ofpaper, not shown. able position to-cut the free extremity I! of thestrip l0. As illustrated, theshape of the out is an arcuate one,the'center of the arc corresponding with the longitudinal axis of thestrip. All of the arcs have equal radii. It will be noted from thepreferred embodiment illustrated in the drawing that the radius ofcurvature of each are has its center on each succeeding are preferablyat the intersection of the central vertical axis with the'succeedingarc. For instance, in Figure 4 of the drawing the center of the are 30is at the point 38. As the strip is fed past the knife successive cuts,indicated by the dotted lines l4, l6, I8, 20, etc., are made, wherebyare formed a series of identical blanks having their upper and loweredges correspondingly curved and their side edges parallel.

specification in the light of the accompanying.

A knife-is arranged at a. suits As illustrated in Figure 4, the sideedges are indicated by the'reference numerals 24, 26, the bottom edge,so termed because it forms the hottom of the cup, by the referencenumeral 28, andthe upper edge, which forms the top of the cup, by thereference numeral 30. The upper and lower sides of each blank may alsobe termed convex and concave, respectively. The cup blank issymmetricalwith respect to the longitudinal axis of the strip of paper M, whichaxis may be termed the vertical axis of the severed blank, as indicatedby the line A-A in Figure 4, which is to say that for every point on theblank to the left of. the axis A-A of Figure 4 there is a correspondingpoint on the portion of the blank lying to the right of the line.

as may be clearly seen from as much of the description as has alreadybeen given, the blanks are successively formed, with the upper edge ofone blank corresponding with the lower edge of the blank in the rear, insuch a manner thetno waste results. Every particle of the paper stripshown in Figure 1 may be employed in forming the cup of Figure 3. Inthis wise a lighter stock may, if desired, be employed, and a strongerstruc= ture will be pmduced by reason of having entirely eliminatedwaste. so far as known, it is believed that this is the first paper cupto be formed from a. continuous strip of paper without waste. In thisconnection it may be remarked that if desired the sharptips or points32, 24 shown in Figure 4 may be removed by cutting along the dottedlines 36, although it will beappreci'ated that such loss of paper isinconsequential and immaterial. In other words, notwithstanding theremoval of these tiny segments, it may be appropriately stated that thecup blank is formed without waste of material. I r

In forming the cup the apex' 28 is located at the central point of thelower arcuate edge 28. The cup is rolled in the manner illustrated inFigure 4, and upon completion assumes the shape shown in Figures 2 and3. The portion of the lower arcuate edge 28 located to the right of theaxis A--A of Figure 4 is folded within the cup and becomes the lineillustrated by the reference numeral 40 of Figures 2, 3 and 4. Theportion of the lower edge 28 located to the left of the axis A--A foldsaround the outside of the cup and becomes the portion illustrated by thereference numeral 42 of Figures 2 and 3. The side edge 26 folds withinthe cup in the manner illustrated by the corresponding reference numeralin Figures 2 and 3, and the left side edge 24 folds on the outside assimilarly illustrated in those figures. When the cup has been folded inthe manner described, it is symmetrically formed or wrapped with respectto its vertical axis 13-3 in Figure 3 in the sense that the edges 24 and28 are similarly positioned on opposite sides of the cup, the right andleft portions 40, 42 of the lower edge are sim-- ilarly' positioned onopposite sides of a plane passing through the central axis 8- 3 and thepoint 1: which marks the junction or the tips 22 and 34 of the blank.

' A cup formed in the manner described is strong and leak-proof. Thepractice heretofore in mak-- ing paper cups has been to reinforce theapex portion by wrapping it thoroughly to form a multiple ply or wrap atthat point. Also heretofore, as illustrated by the Curtin patent alreadyreferred to, it has been customary at the top portion of the cup to haveonly a very small overlap. This has resulted in weaknes at the top ofthe cup and strength at the bottom. In accordance with the presentinvention it is believed that a cup should be strong at the top and thata double wrapped portion at the bottom is not necessary, It is inconformity with this view -that the use of symmetric blanks is permittedand waste is eliminated. In the cup illustrated and described hereend isdouble wrapped to ailord strength.

It is to be appreciated that the cup or container comprehended by thisinvention may be used for various purposes and that modifications in thedesign and construction of the cup maybe made, for instance, otherpliable sheet materials, e. g.. moisture-proof regenerated cellulosicmaterials, rubberized sheet materials, and the like, may be substitutedfor paper, without departing from the true spirit of the invention asset forthin the appended claims.

Having thus described the invention. what I claim as new and desire tosecure by Letters Patent of the United States is:

1. A conical paper cup symmetrically wound from a blank having twostraight parallel sides together with convex and concave sides of equalradii, and with the apex of the cone at the center of the concave side,said cup having a double cave arcuate lower edge and a convex arcuateupper edge of the same radius of curvature as the lower edge. saidradius of curvature for the upper edge having its center at theintersection of the central vertical axis and the concave lower edge.-

3. A conical vessel of the character described formed from a blankcomprising curved upper and lower edges and parallel side edges wound insuch relationship that the lower corners terminate near the top of thevessel and provide a double thickness of material in the upper portionsof said vessel.

4. A conical paper cup formed from a blank comprising curved upper andlower edges and parallel side edges wound in such relationship that thecurved upper edge forms the periphery of the radius of the upper edge,and the corners of the lower edge terminate near the top of the cup. 1 l

5. A conical paper cup formed from a blank comprising two straightparallel sides, an arcuate concave side and an arcuate convex sidehaving the same radius as the concave side and with the center of radiusof the curvature at the center of the concave side, said blank beingsymmetrically wound in such relationship that the convex side forms thetop of the cup. the apex of the cone is at the center of the concaveside and the lower edges terminate at substantially the same point inthe upper portions of the cup, one of said edges being on the inside andthe other on the outside of the cup.

6. A blank for formingconical vessels having a pointed apex, said blankcomprising a lower edge consisting of a single concave arc and an upperedge consisting of a single convex are having the same radius ofcurvature as the concave lower edge and with the center of said radiusof curvature on the said lower concave edge.

7. A blank for forming conical vessels having a pointed apex, said blankcomprising parallel side edges, as lower edge consisting of a singleconcave arc and an upper edge consisting of a single convex arc havingthe same radius of curvature as the concave lower edge andvwith thecenter of said radius of curvature on the said lower conformed from ablank comprising a lower edge consisting of a single concave arc and anupper edge consisting of a single convex are having the same radius ofcurvature as the concave lower edge and with the center of said radiusof curvature on the said lower concave edge, said vessel being formed bywinding said blank around a point on the lower concaveedge as the apexof the cone.

9. A conical vessel having a pointed apex formed from a blank comprisingparallel straight sides, an arcuate concave side and an arcuate convexside having the same radius as the concave side and with the center ofradius of curvature on the concave side, said blank being wopnd around apoint in the central portion of the concave side as the apex of thecone. 1 Y

WALTER. 1:. mm.

